Apparatus for drawing off gases and liquids from pressure systems



Dec. 13, 1927. 1,652,171

| c. HUFF APPARATUS FOR DRAWING OFF GASES AND LIQUIDS FROM PRESSURE SYSTEMS Filed A112. 16, 1925 LYHAN C. HUFF, OF CHICAGO, ILLINOIS,

PATENT OFFICE.

ASSIGNOR TO UNIVERSAL OIL PRODUCTS COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF SOUTH DAKOTA.

APPARATUS FOR DRAWING OFF -GASES AND LIQUIDS FROM PRESSURE SYSTEMS.

Application led August 16, 1923. Serial No. 657,751.

This invention relates to improvements in. apparatus for drawing oif 1i uid materials from pressure systems, and re ers more particularly to an apparatus particularly adapt- 5 ed for use in the cracking system in which oil is distilled under pressure to produce low boiling point hydrocarbons.

Among the objects of the invention are to provide an apparatus for uniformly drawing ol or releasing gas and distillate from a pressure system, thereby maintaining a more constant pressure onthe system and eliminating fluctuations and variations in pressure usually caused by manual control, which are l5 detrimental to good conversion conditions; to provide an apparatus in which automatic pressure control is maintained bycontrolling the gas release line, and a construction pro- Eviding for drawing o and metering the liquid distillate while under pressure, and automatically controlling the-liquid level maintained in the distillate receiver.

The single ligure is a diagrammatic side elevational view of the apparatus with parts broken away, and only such parts of the mechanism shown as is necessary for proper understanding of the invent on.

Referring to the drawing, at 1 is s hown a receiving tank which is connected into a cracking system, not shown. The invention is described in connection with an oil cracking system, but it is understood that it is as adaptable to any type of pressure system where a uniform gaseous pressure -is es- I5 sental and the liquid distillate drawn 0H either continuously or intermittently.

The preceiving' tank is equipped with liquid drawoii' line 2, controlled .by a valve 3, in which line is interposed a liquid metert0 ing device 4 which has a by-pass line 5 controlled by* valves 6 and 7 around the metering gauge. The receiving tank is also equipped lief safety valve 9. At 10 is shown the dis? tillate inlet line from the condenser of the system, not shown. The pressure control is manipulated by a balanced relief valve 11 connected by means of the lines 12 and 13 to the receiving tank. A line 14 co1r 1 pletes the by-pas's in the line 12 which 1s controlled by valves shown at 15, 16 and 17. The balanced relief valve is of a common ty e, and is novel to the present invention on y in so far as it is employed in combination with the rest of the apparatus, to mainwith a pressure gauge 8 and a re- 'tain a constant gas pressure on the Ireceiving tank.

In the lower part of the valve 11 is a diaphragm arrangement 11, pressures upon which are controlled by means of an adjustable weight 11b on the lever arm 11. A line 18 containing a liquid such as water or oil is interposed between the line 13 and the bottom of the diaphragm chamber 11.

The gas is released from the top of the receiving tank by the balanced valve 11, operated by the pressure in the still acting against the diaphragm which opens the balanced valve against the weighted lever 11 which has been adjusted to counterbalance a given pressure on the diaphragm. Any increase in pressure above that for which the weight is set, will raise the lever and allow the valve to open and release gas from the system.

The liquid or distillate on the other hand is metered under pressure being drawn o from the receiving tank through the line 2, passing through the metering gauge shown at 4 and directed back through the line 19 to the loat valve 20 positioned in the receiver. This float valve is attached to a manhole plate shown at 21 in the side of the receiver, and may be readily removed for adjustment or repair. The liquid passing from the float valve is directed throu h the line 22 back to the distillate drawoff ine 2, and iows thence to a storage tank, not shown. The pressure on the liquid is released at the ioat valve, and as explained, is directed to suit-able run-down tanks or storage tanks, al described.

By releasing the' liquid after it passes lthrough the meter, it is measured while in the purely liquid state, and is not effected by the liquid gassing as would be the case if measured after the pressure is released, which would cause the meter to run fast and give an inaccurate registration or reading.

The float valve located at a predetermined elevation in the tank will dischar e the liquid uniformly from the system, an maintain a given oil level in the receiving reservoir.

Both the gas and distillate released are automatic in their operation, and dispense with a pressure tender whose duty it is to release gas and distillate from the system by manually operated valves.

80 means, means within the collecting tank for y This installation is therefore a labor saver, as any number of stills can be 'so equipped and operated from a single receiver house. This installation also maintains a uniform pressure on the stills, which is beneficial in the conversion and cracking of the oil, and results in a more etcient operation, and consequently an increased quantit' and a better quality product.

claim as my invention:

1. In an automatic control for pressure systems, the combination with a collecting means of means for maintaining a predetermined vapor ressure in said collecting means, a liqui draw-oi from said collecting means, a liquid metering gage interposed in' said liquid draw-ofi, a float valve interposed in said liquid draw-oli? beyond said metering gage, said oat valve functioning to maintain a predetermined liquid level in said collecting means and to release the pressure on the liquid subsequent to its passage through said metering gage.

2. An automatic controlling mechanism for pressure systems, comprising a liquid collecting tank, means for maintainin a predetermined pressure in said tank, aliquid outlet means form said tank, a metering gage disposed in said liquid outlet controlling the flow of liquid through said liquid outlet means and for releasmg thc pressure on the 1i uid subsequent to its passa e through sai metering age.

3. n an automatic control or pressure systems, the combination with a collecting means, of means for maintaining a constant predetermined ressure upon the system, a liquid draw-o line communicating with said collecting means means interposed in said li uid draw-oli line for metering the liquid drawn oli from said collecting means, and means automatically maintaining a controlled liquid level in the collecting means and releasing the pressure on the metered liquid.

4. In an automatic control for pressure systems, the combination with a collecting means, of automatic means for releasing accumulated gases from said collecting means and for maintaining a predetermined pressure in said collectin means, a liquid metering gauge and a oat valve interposed vin a liquid draw-olf line for maintaining a predetermined liquid level in said collecting means and for releasing the pressure on the liquid subsequent to its passage through said metering gauge.

LYMAN C. HUFF 

